Clock



FIG. 1 is a front elevational view of a clock showing my new design;

FIG. 2 is a top plan view thereof, the bottom plan view being a mirrorimage thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof, the left side viewbeing a mirror image thereof.

The ornamental design for a clock, as shown.